2w Sub Miniature Express

[waldo]

Cool. I am very interested in this project.

About 6 months agao I bought a half-dozen 6112's and some 6205 pentodes to build a pp low wattage wreckish amp. If I get the darn hospital paid off, I will be able to devert a little cash to my project.

Anyway, I am looking forward to hearing your progress on this!

waldo

[drhulsey]

... I am looking for a good 5 or 6 inch guitar speaker...

The smallest speaker I have any experience with is the Eminence Beta-8. It has a 2" voice coil
This is another exciting project from the gentleman from West Virginia I can't wait to hear it. Keep it comin'

VVR? For that thing, he'll have to start working on a Turbo!

You might be surprised how loud 2W can be (especially to a spouse or neighbor). It's only half as loud as a 20W

[UR12]

Thanks for the kudos everyone! This is my first experience with these little jewels and I have no idea what to expect. (I guess that is why I liike building amps in the first place ) I have tried to find as much info as I can on the web regarding guitar amp projects that other people have done using the sub minis and if this sounds as good as some of those and retains a little of the TW vibe I will be happy.

... I am looking for a good 5 or 6 inch guitar speaker...

The smallest speaker I have any experience with is the Eminence Beta-8. It has a 2" voice coil
This is another exciting project from the gentleman from West Virginia I can't wait to hear it. Keep it comin'

VVR? For that thing, he'll have to start working on a Turbo!

You might be surprised how loud 2W can be (especially to a spouse or neighbor). It's only half as loud as a 20W

Thanks for the tip on the 8". So what did you think about the Eminence? Believe it or not there seems to be quite a few 6" guitar speakers out there. I may have to buy one of each to do a shoot out

I haven't ruled out putting a VVR in this thing. I left the power supply off of the board to give me some options. I have thought of a switching supply (High freq , no hum and smaller filter caps), a conventional supply and something using a wall wart. Once I get it working I will explore some other options. I might be able to even go a little smaller on the PCB depending on how the layout works. I have some Double sided pcb coming in this week also. Lots of brainstorming to go yet but I can't wait to hear this thing fired up.

[sst4270]

Dana,

I paired my LiteRail up with a Jensen P8R... It sounded(s) great. My nephew plays it just about every day...Surprisingly loud and able to acheive quite a bit of that singing TW tone. It can also be turned down pretty low.

FWIW...

Regards,

Steve

[deiseldave]

Dana,

Very cool. I also have some sub miniatures, and have been kicking around similar ideas.
Regarding speakers, I was modeling some smaller speakers in Eminence Designer, and found that a ported Eminence LA6-CBMR shows a pretty decent low end profile, while not being extreme in the top end. It also provides a respectable 97.8db @1W@1M sensitivity.
That's what I'm thinking of trying next. If you want me to share some box plans for that particular driver, I would be happy to. Just let me know.
I have already built a ported box with the Alpha 6A, and it is worked out pretty cool. But the LA6-CBMR is 4.5db hotter, handles 50 more watts, and is lighter. Obviously the wattage handling capabilities are much higher than needed, but I figure that will give you a voice coil that can handle heavily distorted signal without blinking an eye.
Just some thoughts.
BTW, If you make any boards up, I'll buy one from you.

Thanks,

Dave

[sst4270]

+1

I'm interested in a board as well... If they happen.


-SST

[kec]

Dana,

I say you do a mini half stack. That would be cool!

If you need some small caps I know where to get 'em...

[img:640:480]http://img.photobucket.com/albums/v521/ ... s/caps.jpg[/img]

[UR12]

Dana,

I say you do a mini half stack. That would be cool!

If you need some small caps I know where to get 'em...

[img:640:480]http://img.photobucket.com/albums/v521/ ... s/caps.jpg[/img]

Thanks man!

The ones I am using are only 250v. I was thinking of doing a 4x 5" slant front marshall style cab

[drhulsey]

I like the Eminence Beta 8 a lot. It's one of the few 8's with a larger voice coil. I got it for an isolation box project. You won't have too worry about overloading it
Eminence might let one across the Big Sandy

[kec]

Dana,

If this works out and you decide to do a run of boards, put me down for one. This would be a cool project.

[deiseldave]

Regarding speakers, I was modeling some smaller speakers in Eminence Designer, and found that a ported Eminence LA6-CBMR shows a pretty decent low end profile, while not being extreme in the top end. It also provides a respectable 97.8db @1W@1M sensitivity.
That's what I'm thinking of trying next. If you want me to share some box plans for that particular driver, I would be happy to. Just let me know.
I have already built a ported box with the Alpha 6A, and it is worked out pretty cool. But the LA6-CBMR is 4.5db hotter, handles 50 more watts, and is lighter.

Wow ! Disregard all that. I just looked at that speaker again, and see an FS of near 500HZ !! I must have loaded parameters for a different driver in the modeler, or combination of errors. Who knows. Sorry for the error. I will try to make sure I have had at least two cups of coffee next time I post...

[cGil]

Dood! Way to go Dana! Always up to something interesting. Got me curious to look up the tube data, and was surprised to discover the 6112 has a amplification factor of 70. Hmmm! I've got a ZVex Nano with the 6021s cascaded, and it rawks, but those tubes only have an amplification factor of 35? And a conservative 2w from a pair of 5902s? Heh! The SE Zvex is too loud for the bedroom even with an inefficient Jensen P10R. Your little Express should be a real screamer!

Gil...

[UR12]

Wow ! Disregard all that. I just looked at that speaker again, and see an FS of near 500HZ !! I must have loaded parameters for a different driver in the modeler, or combination of errors. Who knows. Sorry for the error. I will try to make sure I have had at least two cups of coffee next time I post...

No Problem......I am thinking maybe 55 - 75 hz to maybe 5k. That shouldn't be a problem for 5 or 6 inch speaker.

[deiseldave]

Either of the Alpha 6's ported should do that.

[RJ Guitars]

...Regarding speakers, I was modeling some smaller speakers in Eminence Designer, and found that a ported Eminence LA6-CBMR shows a pretty decent low end profile, while not being extreme in the top end. It also provides a respectable 97.8db @1W@1M sensitivity. That's what I'm thinking of trying next.

If you want me to share some box plans for that particular driver, I would be happy to. Just let me know.

I have already built a ported box with the Alpha 6A, and it is worked out pretty cool. But the LA6-CBMR is 4.5db hotter, handles 50 more watts, and is lighter. Obviously the wattage handling capabilities are much higher than needed, but I figure that will give you a voice coil that can handle heavily distorted signal without blinking an eye.
Just some thoughts.
BTW, If you make any boards up, I'll buy one from you.

Thanks,

Dave

Dave I'd love to see those speaker box designs... if you don't mind sharing.

rj